Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hanh via » hanh vi, hanh va, anh va
hieu va » lieu va, hieu qua
duc van » duc tan, duc manh, duc phan
via cua » gia cua, gian cua, giau cua
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((x hoi) OR (o hoi)). hieu va cao ((duc van) OR (duc va)) hanh via cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((x hoi) OR (o hoi)). hieu va cao ((duc van) or (duc va)) hanh via cua triet~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((x hoi) OR (o hoi)). hieu va cao ((duc van) or (duc va)) hanh via cua triet*.